NAME

Mojo::Reactor - Low level event reactor base class

SYNOPSIS

  package Mojo::Reactor::MyEventLoop;
  use Mojo::Base 'Mojo::Reactor';

  $ENV{MOJO_REACTOR} ||= 'Mojo::Reactor::MyEventLoop';

  sub io         {...}
  sub is_running {...}
  sub one_tick   {...}
  sub recurring  {...}
  sub remove     {...}
  sub start      {...}
  sub stop       {...}
  sub timer      {...}
  sub watch      {...}

DESCRIPTION

Mojo::Reactor is an abstract base class for low level event reactors.

EVENTS

Mojo::Reactor can emit the following events.

error

  $reactor->on(error => sub {
    my ($reactor, $err) = @_;
    ...
  });

Emitted safely for exceptions caught in callbacks.

  $reactor->on(error => sub {
    my ($reactor, $err) = @_;
    say "Something very bad happened: $err";
  });

METHODS

Mojo::Reactor inherits all methods from Mojo::EventEmitter and implements the following new ones.

detect

  my $class = Mojo::Reactor->detect;

Detect and load the best reactor implementation available, will try the value of the MOJO_REACTOR environment variable, Mojo::Reactor::EV or Mojo::Reactor::Poll.

  # Instantiate best reactor implementation available
  my $reactor = Mojo::Reactor->detect->new;

io

  $reactor = $reactor->io($handle => sub {...});

Watch handle for I/O events, invoking the callback whenever handle becomes readable or writable. Meant to be overloaded in a subclass.

  # Callback will be invoked twice if handle becomes readable and writable
  $reactor->io($handle => sub {
    my ($reactor, $writable) = @_;
    say $writable ? 'Handle is writable' : 'Handle is readable';
  });

is_readable

  my $success = $reactor->is_readable($handle);

Quick non-blocking check if a handle is readable, useful for identifying tainted sockets.

is_running

  my $success = $reactor->is_running;

Check if reactor is running. Meant to be overloaded in a subclass.

one_tick

  $reactor->one_tick;

Run reactor until an event occurs or no events are being watched anymore. Note that this method can recurse back into the reactor, so you need to be careful. Meant to be overloaded in a subclass.

  # Don't block longer than 0.5 seconds
  my $id = $reactor->timer(0.5 => sub {});
  $reactor->one_tick;
  $reactor->remove($id);

recurring

  my $id = $reactor->recurring(0.25 => sub {...});

Create a new recurring timer, invoking the callback repeatedly after a given amount of time in seconds. Meant to be overloaded in a subclass.

  # Invoke as soon as possible
  $reactor->recurring(0 => sub { say 'Reactor tick.' });

remove

  my $success = $reactor->remove($handle);
  my $success = $reactor->remove($id);

Remove handle or timer. Meant to be overloaded in a subclass.

start

  $reactor->start;

Start watching for I/O and timer events, this will block until stop is called or no events are being watched anymore. Meant to be overloaded in a subclass.

stop

  $reactor->stop;

Stop watching for I/O and timer events. Meant to be overloaded in a subclass.

timer

  my $id = $reactor->timer(0.5 => sub {...});

Create a new timer, invoking the callback after a given amount of time in seconds. Meant to be overloaded in a subclass.

  # Invoke as soon as possible
  $reactor->timer(0 => sub { say 'Next tick.' });

watch

  $reactor = $reactor->watch($handle, $readable, $writable);

Change I/O events to watch handle for with true and false values. Meant to be overloaded in a subclass. Note that this method requires an active I/O watcher.

  # Watch only for readable events
  $reactor->watch($handle, 1, 0);

  # Watch only for writable events
  $reactor->watch($handle, 0, 1);

  # Watch for readable and writable events
  $reactor->watch($handle, 1, 1);

  # Pause watching for events
  $reactor->watch($handle, 0, 0);

SEE ALSO

Mojolicious, Mojolicious::Guides, http://mojolicio.us.

cpanm Mojolicious

perl -MCPAN -e shell
install Mojolicious